Circuit arrangement for receiving radioenergy



Examiner oma, lzs. 1,469,328

.5. AYER ET Al..

aucun' Aa mmm' Fon nllczIvINe RADIOENERGY L *,L Filed Aug. 3 1922 vwzntoz K EMIL MN5/5m AUGUST UEB @51g his z l. l f

250. RADANT ENERGY.

Patented Oct. 2, 1923.

UNITED STATES tix-amitier PATENT OFFICE.

EMIL MAYER AND AUGUST LEIB, 0F BERLIN, GERMANY, ASSIGNORS T0 GESELLSCHAFT FR DRAHTLOSE TELEGRAPHIE M. B. H., HALLESCHES, 0F BERLIN, GERMANY, A.

CORPORATIDN 0F GERMANY.

CIRCUIT ARRANGEMENT FOR RECEIVING RADIOENEBGY.

Application led August 3, 1922. Serial No. 579,385.

To all whom z't my concern.'

Be it known that EMIL MAYER and AUGUST LEIB, citizens of the Republic of Germany, and residents of Hallesches Ufer 12/13, Berlin, S. WV. 1l, Germany, have invented new and useful Improvements in Circuit Arrangements for Receiving Radioenergy (for which we have filed application in Germany Aug. 2, 1921), of which the following is a specification accompanied by drawings.

In all secondary receivers, it is necessary to time lirst the primary circuit and then the secondary circuit to t-he unknown sender by suitably varying the coupling of the two circuits. The present invention relates particularly to secondary receivers with cathode tubes and simplifies the timing op` eration to a great extent. It has the further advantage that no switching of the cathode tubes is necessary and that during the final transfer to the secondary receiver, the primary cathode tube has the new and important function of reducing the damping in the primary circuit without any change in its connection with the primary circuit.

The single figure of the drawing is a diagrammatic representation of a simple circuit arrangement embodying the invention.

In accordance with the invention, the receiving arrangement consists of two tuned circuits, one of which I serves as a primary and the other II as a secondary circuit. The circuits contain cathode receiving tubes RP and RS respectively, which are variably back coupled. During the primary receiving the telephone or other suitable indicator T and the primary receiving tube RP are employed, and during the secondary receiving the cathode tube RS is used. In changing from primary to secondary receiving with the present arrangement, in which the cathode tube RP of the primary receiving circuit is not Switched off but is permitted to continue in operation, the primary cathode tube RP may be caused not to produce oscillations and the resistance of the primary circuit I and, consequently, the dam ing of the received energy may be material y reduced by suitably adjusting the back coupling R of the tube RP to the primary circuit. In the use of the invention, the primary receiver not only enables the arrangement to be tuned readily to the wave length of the incoming energy and thereby facilitates the tuning of the secondary receiver, but fthe continued operation of the primary lreceiver during receiving through the secondary receiver reduces the damping in the primary circuit and thus improves the action 'of the secondary receiver. The secondary tube RS is differently back coupled to the secondary circuit, depending upon whether it is used for producing local oscillations, or as a simple audion when there is a sep-, arate transformer. The use of the primary tube RP for the purpose of back coupling anl reducing the damping makes ossible the employment in all circuits of igh resistance coils wound with thin wire. Such coils are cheap and consume only slight current, and the action of the tube RP- in reducing the damping enables coils of such character to be used without detracting from the selectivity of the arrangement.

In accordance with the present invention, one may go even further and provide a similar third circuit which also comprises a cathode tube with variable back coupling whereby a tertiary receiver is obtained with damping reduction in all circuits, or the third circuit may be used as a wave meter. TheI variable back coupling makes it possible to use the cathode tube in this circuit as a simple detector, and in this manner the wave meter may be used as a receiver or, by using a second calibration scale, the back coupling may be made closer so that the tube operates as a generator and the sender becomes a sending wave meter. In this case the tuning in the circuit to be tuned is tested by means of the telephone.

Having described our invention, what we claim is:

l. A circuit arrangement for receiving radio energy, comprising a primary tuned circuit, a seconda tuned circuit coupled with the primary circuit, and a plurality of thermionic vacuum tubes one of which is connected on its input side to the secondary tuned circuit and is back-coupled to said secondary circuit soas to be operable to roduce oscillations therein and to act as a etector and the other of which is connected on its input side to and back-coupled with the primary circuit, thereby causing it to be operable at will either as a detector, when the -dampin first mentioned tube is used as an oscillator, or to reduce the apparent resistance of the primary circuit for the frequency being received, when the first-mentioned tube is operated as a detector, and thereby reduce the damping of the received energy.

2. "A circuit arrangement for receivin radio energy comprising a primary tune circuit, a secondary tuned circuit coupled with the primary circuit, a primary receiver and a secondary receiver, said secondary receiver comprising a thermionic vacuum tube connected on its input side to said secondary circuit and backcoupled thereto so as to be operable to produce oscillations and as a detector and said primary receiver comprising a thermionic vacuum tube connected to the primary circuit and back-coupled thereto, said backcoupling being adjustable so as either to cause the primary vacuum tube to act as a detector or to reduce the apparent resistance of the primary circuit and, consequently, the of the received energy which is supplie to the secondary receiver.

3. A circuit arrangement for receivin radio energy comprising a primary tune circuit, a secondary tuned circuit coupled with Papin e t al the primary circuit, a primary receiver and a secondary receiver, said primary receiver comprising a thermionlc vacuum tube and an indicator and being adjustably back-coupled with the primary circuit, and said secondary receiver also comprising a thermionic vacuum tube and an indicator and being adjustably back-coupled to the secondary circuit.

4. A circuit arrangement for receiving radio energy comprising a primary tuned circuit, a secondary tuned circuit, coils for coupling said circuits together, a primary receiver and a secondary receiver, said secondary receiver comprising a thermionic vacuum tube connected on its input side to said secondary circuit and coils for back-couplin the output side of the vacuum tube to sai secondar circuit so as to cause the tube to be opera le to produce oscillations and as a detector, and said primary receiver comprising a thermionic vacuum tube connected to the primary circuit and coils for back-coupling the output side of the primary tube to the primary circuit, said coils being of small size and being Wound with thin Wire having high resistance and said last-mentioned coils being adjustable so as either to cause the primary vacuum tube to act as a detector or to reduce the apparent resistance of the primary circuit, and, consequently, the damping of the received energy.

EMIL MAYER. AUGUST LEIB.

1,554,155 25o-2o f' 'f 1,555,575 250-20 wright 1,594,600 o-2o clement 1,415,952 250-20 Round (Br. 140,445 25o-2o 

